/*
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rich $alz of BBN Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)clri.c   8.2 (Berkeley) 9/23/93
 * $FreeBSD: src/sbin/clri/clri.c,v 1.4 1999/08/28 00:12:32 peter Exp $
 * $DragonFly: src/sbin/clri/clri.c,v 1.8 2006/04/03 01:58:48 dillon Exp $
 */

#include <sys/param.h>

#include <vfs/ufs/dinode.h>
#include <vfs/ufs/fs.h>

#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

static void
usage(void)
{
        fprintf(stderr, "usage: clri filesystem inode ...\n");
        exit(1);
}

int
main(int argc, char **argv)
{
        struct fs *sbp;
        struct ufs1_dinode *ip;
        int fd;
        struct ufs1_dinode ibuf[MAXBSIZE / sizeof (struct ufs1_dinode)];
        long generation, bsize;
        off_t offset;
        int inonum;
        char *fs, sblock[SBSIZE];

        if (argc < 3)
                usage();

        fs = *++argv;

        /* get the superblock. */
        if ((fd = open(fs, O_RDWR, 0)) < 0)
                err(1, "%s", fs);
        if (lseek(fd, (off_t)SBOFF, SEEK_SET) < 0)
                err(1, "%s", fs);
        if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
                errx(1, "%s: can't read superblock", fs);

        sbp = (struct fs *)sblock;
        if (sbp->fs_magic != FS_MAGIC)
                errx(1, "%s: superblock magic number 0x%x, not 0x%x",
                    fs, sbp->fs_magic, FS_MAGIC);
        bsize = sbp->fs_bsize;

        /* remaining arguments are inode numbers. */
        while (*++argv) {
                /* get the inode number. */
                if ((inonum = atoi(*argv)) <= 0)
                        errx(1, "%s is not a valid inode number", *argv);
                printf("clearing %d\n", inonum);

                /* read in the appropriate block. */
                offset = ino_to_fsba(sbp, inonum);      /* inode to fs blk */
                offset = fsbtodb(sbp, offset);          /* fs blk disk blk */
                offset *= DEV_BSIZE;                    /* disk blk to bytes */

                /* seek and read the block */
                if (lseek(fd, offset, SEEK_SET) < 0)
                        err(1, "%s", fs);
                if (read(fd, ibuf, bsize) != bsize)
                        err(1, "%s", fs);

                /* get the inode within the block. */
                ip = &ibuf[ino_to_fsbo(sbp, inonum)];

                /* clear the inode, and bump the generation count. */
                generation = ip->di_gen + 1;
                memset(ip, 0, sizeof(*ip));
                ip->di_gen = generation;

                /* backup and write the block */
                if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
                        err(1, "%s", fs);
                if (write(fd, ibuf, bsize) != bsize)
                        err(1, "%s", fs);
                fsync(fd);
        }
        close(fd);
        exit(0);
}